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When you snap the desktop to the side of the screen, every running Windows app gets its own thumbnail. Click a thumbnail to exand that desktop and switch to that program.
From the Windows 8 desktop, you can pin just about anything to the Start screen, including a website, as shown here.
Note to Redmond: You'll want to clean up that "Start menu" reference before RTM.
Well-written Metro style apps work just fine when snapped to the side of the screen. This messaging thread fits neatly into the snapped space.